I just replaced my B&O sub with a pair of 12s and a decent amp...so I'm getting back into the stereo. I had to have the bass turned up before, because the system just didn't have it. Now with the subs, I have the bass flat again. Played with the Stereo and Surround settings this morning to see if it made a change in the sub output.
I use Android Auto, so I'm not sure how that affects the audio settings. I suppose they probably still work, and I have Surround turned off. I always turn Surround off on audio systems, it makes music too artificial to my ears. I like it as clean and true to the source material as possible.